U.S. patent application number 14/244932 was filed with the patent office on 2014-10-09 for tool cassette for insertion in a cassette seat and tool having a cassette seat for a tool cassette of this type.
This patent application is currently assigned to Kennametal Inc.. The applicant listed for this patent is Kennametal Inc.. Invention is credited to Peter Karl Mergenthaler.
Application Number | 20140301795 14/244932 |
Document ID | / |
Family ID | 51567571 |
Filed Date | 2014-10-09 |
United States Patent
Application |
20140301795 |
Kind Code |
A1 |
Mergenthaler; Peter Karl |
October 9, 2014 |
Tool Cassette for Insertion in a Cassette Seat and Tool Having a
Cassette Seat for a Tool Cassette of This Type
Abstract
A tool has a tool carrier having a tool cassette with a main
body, into which an insert seat for receiving the exchangeable
cutting insert is recessed and which has a guide, extending along a
direction of adjustment, for an adjusting element for adjusting the
position of the main body in the cassette seat in the direction of
adjustment. The main body has a first mating surface and at least
one second mating surface, wherein the first mating surface extends
transversely to the direction of adjustment and the second mating
surface extends in the direction of adjustment, and the mating
surfaces are configured for the precisely fitting contact against a
corresponding first and second contact surface of the cassette
seat.
Inventors: |
Mergenthaler; Peter Karl;
(Markt Bibart, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kennametal Inc. |
Latrobe |
PA |
US |
|
|
Assignee: |
Kennametal Inc.
Latrobe
PA
|
Family ID: |
51567571 |
Appl. No.: |
14/244932 |
Filed: |
April 4, 2014 |
Current U.S.
Class: |
407/88 |
Current CPC
Class: |
B23B 2251/54 20130101;
B23C 5/241 20130101; B23B 2260/038 20130101; B23B 2260/004
20130101; Y10T 407/1918 20150115; Y10T 408/8598 20150115; B23C
5/2472 20130101; Y10T 407/2244 20150115; B23C 2210/168 20130101;
B23B 51/048 20130101; B23C 2245/00 20130101 |
Class at
Publication: |
407/88 |
International
Class: |
B23C 5/24 20060101
B23C005/24 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 5, 2013 |
DE |
102013206093.9 |
Claims
1-15. (canceled)
16. A tool cassette for insertion in a cassette seat of a tool
carrier, the tool cassette comprising: a main body including: an
insert seat recessed therein for receiving an exchangeable cutting
insert; a guide extending along a direction of adjustment and
configured for receiving an adjusting element for adjusting the
position of the main body in the cassette seat in the direction of
adjustment over an adjustment travel of at least 0.5 mm; and a
guide pin that protrudes radially inwardly from a rear surface of
the main body in the direction of adjustment, wherein the main body
has a first mating surface and at least one second mating surface
configured on at least one side of the guide pin, wherein the first
mating surface extends transversely to the direction of adjustment
and the second mating surface extends in the direction of
adjustment and the mating surfaces are configured for precisely
fitting contact against a corresponding first and second contact
surface of the cassette seat, so that the main body, apart from its
mobility in the direction of adjustment, resides in a precisely
fitting manner in the cassette seat.
17. The tool cassette as claimed in claim 16, wherein the adjusting
element is configured as a threaded bolt.
18. The tool cassette as claimed in claim 16, wherein the guide is
configured on a marginal side of the main body as a half-shell-like
channel into which the adjusting element is insertable.
19. The tool cassette as claimed in claim 18, wherein the guide has
a bidirectional stop against which the adjusting element rests with
a counterstop.
20. The tool cassette as claimed in claim 19, wherein the stop is
configured as a partially annular web formed in the guide and the
counterstop is configured by an annular groove on the adjusting
element.
21. The tool cassette as claimed in claim 16, wherein the insert
seat is bounded at the margin in the direction of adjustment by a
contact web which is adjoined with the formation of a step by the
guide pin, wherein the first mating surface is configured on the
contact web, and the second mating surface is configured on both
sides of the guide pin, respectively.
22. The tool cassette as claimed in claim 16, further including a
clamping body which is configured to clamp the main body in the
cassette seat.
23. The tool cassette as claimed in claim 22, wherein the clamping
body has a laterally protruding clamping web which engages in a
lateral recess in the main body such that in the assembled state
the clamping body clamps the main body transversely to the
direction of adjustment, in the direction of a bottom side of the
main body, against the cassette seat.
24. The tool cassette as claimed in claim 23, wherein the clamping
web is configured such that it is inclined downward in the
direction of the bottom side.
25. The tool cassette as claimed in claim 24, wherein the recess is
configured as a groove which is open at an end thereof.
26. A tool, comprising: a cassette seat that extends in a direction
of adjustment and includes: a bottom base surface; an upper, first
contact surface extending transversely to the direction of
adjustment; and a lateral, second contact surface extending in the
direction of adjustment; and a tool cassette including: a bottom
side for engaging the bottom base surface of the cassette seat; an
insert seat recessed therein for receiving an exchangeable cutting
insert; a guide extending along a direction of adjustment and
configured for receiving an adjusting element for adjusting the
position of the tool cassette in the cassette seat in the direction
of adjustment over an adjustment travel of at least 0.5 mm; a guide
pin that protrudes radially inwardly from a rear surface of the
tool cassette in the direction of adjustment; and a first mating
surface and at least one second mating surface configured on at
least one side of the guide pin, wherein the first mating surface
extends transversely to the direction of adjustment and the second
mating surface extends in the direction of adjustment and the
mating surfaces are configured for precisely fitting contact
against the corresponding first and second contact surfaces of the
cassette seat, so that the tool cassette, apart from its mobility
in the direction of adjustment, resides in a precisely fitting
manner in the cassette seat.
27. The tool as claimed in claim 26, wherein the cassette seat has
a pocket, and an upper side face of the pocket forms the first
contact surface.
28. The tool as claimed in claim 27, wherein the pocket extends in
the direction of adjustment at least over an adjustment travel of
the tool cassette, such that, once the tool cassette is installed,
the first mating surface thereof bears at all times against the
first contact surface and is thereby covered by the pocket.
29. The tool as claimed in claim 28, wherein a further insert seat
for the detachable fastening of a further cutting insert is formed,
wherein the first contact surface is disposed beneath the further
insert seat so that, during operation, the further cutting insert
is supported by the tool cassette.
30. The tool as claimed in claim 29, wherein the tool cassette is
configured for an adjustment travel of the tool cassette of 0.5
mm.
31. The tool as claimed in claim 29, wherein the tool cassette is
configured for an adjustment travel of the tool cassette of 1.5
mm.
32. The tool as claimed in claim 29, wherein the tool cassette is
configured for an adjustment travel of the tool cassette of 2.5 mm.
Description
BACKGROUND OF THE INVENTION
[0001] In modular carrier tools, for example in drilling or milling
tools, reversibly exchangeable cutting inserts, in particular tool
bits, are frequently fastened to a tool carrier. For setting the
exact, in particular radial position of a cutter, there are
different adjustment mechanisms. In some cases, the cutting inserts
are fastened to a tool cassette, which is then itself adjustable in
relation to the tool carrier.
[0002] Usually, the adjustment mechanisms here allow a cutter
position of the cutting body to be finely adjusted with high
accuracy, yet usually with only a very small adjustment travel of
typically maximally up to 0.1 mm With fine adjustment mechanisms of
this type, the cutters can therefore be set exactly to a predefined
nominal drilling diameter, for which the tool carrier is configured
in combination with the respective cutting insert.
SUMMARY OF THE INVENTION
[0003] Based on the above, the object of the invention is to define
a tool cassette, and a tool for receiving such a tool cassette,
which are also suitable for rough machining or roughing.
[0004] The object is achieved according to the invention by a tool
cassette having the features of claim 1 and by a tool having the
features of claim 11.
[0005] Advantageous refinements are respectively contained in the
subclaims. The tool cassette serves in general terms for insertion
in a cassette seat of a tool carrier, in particular of a roughing
tool. It has a main body, into which an insert seat for receiving
an exchangeable cutting insert, for example an indexable insert, is
recessed. The main body has a guide, which extends along a
direction of adjustment and in which, in the assembled end setting,
an adjusting element for adjusting the position of the main body
resides in the cassette seat. The direction of adjustment is here,
in particular, a radial direction perpendicular to a central
longitudinal axis of the tool carrier. A large adjustment travel of
at least 0.5 mm, preferably of at least 1.5 mm and up to 2.5 mm or
beyond, is here enabled. In order to enable this large adjustment
travel for a rough adjustment, in particular for a roughing tool,
the main body has a first, upper mating surface and at least a
second, lateral mating surface, wherein the first mating surface
extends transversely to the direction of adjustment and the second
mating surface extends in the direction of adjustment. Preferably,
the mating surfaces are here respectively present in pairs on
opposite sides of the main body. They serve respectively for the
precisely fitting contact of the main body against a corresponding
first and second contact surface of the cassette seat, such that
the main body, apart from its mobility in the direction of
adjustment, resides in a precisely fitting manner displaceably in
the cassette holder. This precisely fitting guidance is here
ensured at least over said adjustment travel of at least 0.5 mm,
preferably 1.5 mm, and in particular 2.5 mm or beyond.
[0006] All in all, this tool cassette therefore serves for use in a
tool carrier configured as a roughing tool, i.e. for rough
machining, in particular for the production of drill holes or for
boring operations. The use of the tool cassette is not, however,
limited to drilling tools. As a result of the very large range of
adjustment, for example of up to 2.5 mm, in tools of this type the
nominal diameter can therefore be varied, in total, by up to 5 mm,
if two such tool cassettes are arranged opposite each other. The
field of use of such a tool can thereby be extended over several
nominal diameters. The tool is here configured, in total, for the
production of drilling diameters greater, typically, than 30 mm, in
particular greater than 50 mm, up to drilling diameters of around
100 mm.
[0007] The adjusting element is here expediently configured as a
threaded bolt. The thread is here configured as a conventional
metric thread, or else as a fine thread. The adjustment is
therefore made in a simple manner by turning of the bolt.
[0008] The adjusting element here resides in the main body in a
guide, which is expediently configured as a laterally open, in
particular half-shell-like channel, into which the adjusting
element is insertable. The adjusting element is therefore not stuck
through the main body, but is laterally inserted. Expediently,
correspondingly to the guide on the main body, a guide channel is
also configured on the cassette seat.
[0009] In an expedient refinement, the laterally open design
enables the arrangement of a bidirectional stop, against which the
adjusting element rests with a corresponding counterstop. The stop
is here expediently configured as a (partially) annular web within
the half-shell-like channel, and the counterstop is configured by
an annular groove on the bolt. A particularly simple and, at the
same time, robust design of the adjustment mechanism is hereby
sufficient.
[0010] The insert seat is preferably bounded at the margin, in the
direction of adjustment, by a contact web, which is adjoined, with
the formation of a step, by a guide pin. The first mating surface
is here configured on the contact web, and the second mating
surface is configured on both sides of the guide pin, respectively.
The cassette seat configured complementarily to the tool cassette
therefore correspondingly has also a stepped pocket, into which the
tool cassette is introduced with the mating surfaces. As a result
of the configuration of the step, the height of the necessary
recess in the tool carrier is reduced in the region of the second
mating surfaces, so that a high wall thickness remains in the tool
carrier in the region of the guide pin. This has a positive impact
on the stability of the tool carrier, particularly if further
insert seats are configured on the tool carrier, and the cutting
forces of these cutting bodies, which cutting forces are generated
in the course of the machining, must be absorbed by the tool
carrier.
[0011] The width of the contact web in the direction of adjustment
is here comparatively thin and lies, in particular, somewhat above
the maximal adjustment travel, for example in the range of 1.5 to 3
times the adjustment travel. This measure serves to ensure that the
upper surface of the contact web, which is configured as the first
mating surface, bears over the whole of the adjustment travel also
against the associated first stop face of the cassette seat. In
addition, this yields the further advantage that, over the whole of
the range of adjustment, the pocket of the cassette seat covers
this contact web at least in some areas, so that no slit into which
dirt particles can enter is formed.
[0012] For the clamping of the tool cassette in the cassette seat,
a clamping body is additionally provided alongside the main body.
The adjustment of the main body is therefore realized in isolation
from and independently from the clamping of the main body. The
clamping body is here configured, in particular, in the style of a
clamping claw.
[0013] Expediently, the clamping body has a laterally protruding
clamping web, which engages in a lateral recess in the main body.
The clamping web and the clamping body are configured such that, in
the assembled state, the clamping body clamps the main body
transversely to the direction of adjustment, in the direction of a
bottom side of the main body, against a bottom base surface of the
cassette seat. To this end, the clamping web is preferably
configured such that it is inclined, or else cranked, downward in
the direction of the bottom side, so that tilting of the tool
cassette during clamping of the clamping body is as far as possible
avoided.
[0014] In order to enable simple assembly, the recess is here
configured as a groove which is open at the end and which extends
in the direction of adjustment. There is hence the possibility of
inserting the clamping body into a pocket-like clamping body
receptacle in the cassette seat and of subsequently sliding the
main body in the direction of adjustment into the pocket of the
cassette seat.
[0015] The design of the cassette seat on the tool carrier is
complementary to the design of the tool cassette and derives, in
particular, from the subclaims assigned to the tool. The tool
carrier therefore has contact surfaces assigned to the mating
surfaces, which contact surfaces are formed, in particular, by
marginal sides of a preferably stepped pocket. The tool cassette
resides in a precisely fitting manner in the cassette seat with its
mating surfaces on the associated contact surfaces. By "reside in a
precisely fitting manner" is here understood a play-free
positioning perpendicular to the direction of adjustment. Necessary
lead-in tolerances are merely provided to enable the tool cassette
to be introduced into the cassette seat and displaced therein. In
comparison to the tool cassette, the cassette seat has in the
region of the contact surfaces preferably at most a small
overmeasure in the region of, for example, maximally up to 0.05
mm.
[0016] In an expedient design, on the tool carrier a further insert
seat for a further cutting body is configured on the bottom of the
cassette seat and the first contact surface is disposed beneath
this further insert seat. By "beneath" is here understood a
positioning of the contact surface such that, during operation,
cutting forces which are generated in the course of the machining
are reliably absorbed over the contact surface, and thus over the
tool cassette. An improved support of the further cutting body is
thereby obtained.
[0017] In expedient refinements, correspondingly to the guide on
the main body, a guide channel for the adjusting element is
configured on the bottom of the cassette seat, so that, in
combination with the channel-like guide on the main body, in total
a roughly circular guide channel for the adjusting element is
configured. In an end-face side wall of the cassette seat is sunk,
in alignment with the guide, a threaded bore, into which the bolt
can be screwed with its thread region.
[0018] In addition, the cassette seat has adjacent to the section
for the main body an, in particular, pocket-shaped receptacle, into
which the clamping body can be inserted. On the bottom, the
receptacle has a threaded bore to enable the clamping body to be
clamped against the main body with the aid of a tensioning
screw.
[0019] For the adjustment of the position of the tool cassette
within the cassette seat, the clamping body is first loosened
somewhat, so that the tool cassette is displaceable in the
direction of displacement. The adjustment can subsequently be
realized by means of the adjusting element, before then, in the
desired position again, the clamping is realized via the clamping
body. The adjusting element itself therefore serves primarily only
to perform the adjusting movement. The securement in the desired
position is realized mainly by the clamping fastening via the
clamping body.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] An illustrative embodiment of the invention is explained in
greater detail below with reference to the figures, wherein:
[0021] FIG. 1 shows a tool configured as a drilling tool and having
a tool carrier in which, on the end face, a plurality of cutting
inserts are inserted partially with the aid of tool cassettes,
[0022] FIG. 2A shows a partial side view in the end face region of
the tool according to FIG. 1.
[0023] FIG. 2B shows a sectional view according to the sectional
line C-C in FIG. 2A,
[0024] FIG. 2C shows a side view similar to FIG. 2A after a
90.degree. rotation of the tool about a central longitudinal
axis,
[0025] FIG. 2D shows a partially enlarged representation of the
sectional representation according to FIG. 2B in the region of the
tool cassette,
[0026] FIGS. 3A-3F shows the tool cassette with therein fastened
cutting insert in various views, wherein FIG. 3B shows a side view,
FIGS. 3A and 3C show, based on FIG. 3B, respectively a view after a
90.degree. rotation respectively to left and right about a vertical
axis, FIGS. 3E and 3F show views after a 90.degree. rotation
respectively upward and downward about a horizontal axis, based on
the view according to FIG. 3B, and FIG. 3D shows a side view of the
opposite side in comparison to the view according to FIG. 3B, i.e.
after a 180.degree. rotation about a vertical axis.
[0027] FIGS. 4A-4E show various views of the clamping body, wherein
FIG. 4A shows a side view, FIG. 4B shows a view rotated relative
hereto through 90.degree. to the right about a vertical axis, FIG.
4C shows a view rotated relative to FIG. 4B through 90.degree.
upward about a horizontal axis, FIG. 4D shows a view rotated
relative to FIG. 4B through 90.degree. downward about a horizontal
axis, and FIG. 4E shows a sectional view along the sectional plane
A-A according to FIG. 4A, and
[0028] FIG. 5 shows a side view of the bolt-shaped adjusting
element.
[0029] In the figures, parts which have the same effect are
respectively provided with the same reference symbols.
DETAILED DESCRIPTION
[0030] The tool represented in FIG. 1 is configured as a drilling
tool and has a tool carrier 2 which extends along a central
longitudinal axis 4, which at the same time forms a rotational
axis. At the rear end, the tool carrier has a clamping shank 6 for
clamping in a machine tool. In a shank region adjoining the
clamping shank 6, the tool carrier 2 has chip grooves 8. On the end
face, a plurality of cutting inserts are fastened to the tool
carrier 2, namely radially outer cutting inserts 10A, which are
respectively fastened in a tool cassette 12 in an insert seat 13,
and inner cutting inserts 10B, which are fastened directly in a
respectively further insert seat 14 in the tool carrier 2. The
cutting inserts 10A, 10B are here configured respectively as
indexable inserts. The cutting circles of the outer cutting inserts
10A substantially intersect, whereas the cutting circles of the
inner cutting inserts 10B substantially adjoin one another, so that
for all cutting inserts 10A, 10B comparable cutting loads are
obtained during operation.
[0031] The tool cassette 12 serves to receive the respectively
radially outer cutting insert 10A and is correspondingly fastened
at a radially outer position to the tool carrier 2. The tool
cassette 12 here comprises a lateral clamping body 16 for clamping
fastening, which resides in a pocket-like receptacle 17 (cf. FIG.
2C) in the tool carrier 2. The tool cassette 12 can be adjusted in
the direction of adjustment 18 perpendicular to the central
longitudinal axis, i.e. in the radial direction, with the aid of an
adjusting element 20, which extends in the direction of adjustment
18. The cutting inserts 10A, 10B are respectively fastened in their
respective insert seats 13, 14 with the aid of fastening screws
22.
[0032] As can be seen, in particular, from the enlarged
representation of FIG. 2D, the tool cassette 12 has a main body 24,
which resides in a cassette seat 26 of the tool carrier 2. The
cassette seat 26 here has a stepped pocket 28. In the front region
of the pocket 28, the latter forms on its top side a first contact
surface 30A for a corresponding first mating surface 32A on the
main body 24 (regarding the first mating surface 32A, cf., in
particular, FIGS. 3B and 3F). In the rear pocket region 28, i.e.
after the step in the direction of adjustment 18, the lateral limit
walls of the pocket 28 are configured as opposite second contact
surfaces 30B. In FIG. 2D, only the rear limit wall can be seen. The
contact surfaces 30B serve for the contact of opposite second
mating surfaces 32B of the main body 24 (regarding the second
mating surfaces 32B, cf. in particular FIGS. 3B and 3C).
[0033] As can be seen, in particular, also in connection with FIG.
5, the adjusting element 20 is configured as a bolt having a thread
34. With the thread 34, the adjusting element 20 extends into a
threaded bore 36 (FIG. 2D) adjoining the pocket 28. The adjusting
element 20 is fully received by the main body 24.
[0034] The design of the main body 24 can best be seen from FIGS.
3A-3F. The main body 24 is of roughly cuboid configuration in total
and has on its front side the inclined insert seat 13, which is
bounded in the direction of adjustment 18 by a contact web 38 and
by a further lateral, wider marginal web. The insert seat 13
therefore has in total, for instance, an L-shaped contact surface.
Two cutters of the, in the illustrative embodiment, square cutting
insert 10A are therefore free. The top side of the contact web 38
here forms the first mating surface 32A.
[0035] In the direction of adjustment 18, the contact web 38 is
adjoined, with the formation of a step, by a guide pin 40, the two
opposite side faces of which form the second mating surfaces
32B.
[0036] As can be seen, in particular, also from the side view of
FIG. 2D, the upper side of the guide pin 40 has clearance to the
associated wall of the pocket 28.
[0037] The main body 24 has opposite the insert seat 13 a bottom
side 42, in which a channel-like guide 44 is recessed. Within the
guide 44, a partially annular web 46 is configured as a stop,
against which, in both directions, the adjusting element 20 rests
with respectively a counterstop 48 for the performance of the
adjusting movement and the transmission of the adjusting force. The
opposite counterstops 48 are here created by an annular groove 50
and are formed by the lateral circumferential annular faces of the
annular groove 50 (cf. FIG. 5).
[0038] From the view of the bottom side 42 according to FIG. 3E, in
addition to the guide 44, in the region of the insert seat 13 can
also be seen another threaded bore 36, which in this case is
configured as a through bore and is provided for fastening of the
cutting insert 10A with the aid of the fastening screw 22.
[0039] Finally, from the side view of FIG. 3D, a recess 52 can also
be seen. In the direction of adjustment 18, i.e. in the direction
of the pocket 28--other than represented in FIG. 3D--said recess is
expediently configured as an open groove without rear limit
wall.
[0040] This recess 52 serves to receive a clamping web 54 of the
clamping body 16, as is represented in FIGS. 4A-4E. The clamping
web 54 is here shaped on a marginal side of the clamping body 16 as
a downwardly cranked element. In addition, on a bottom side are
located two supporting regions 58, with which the clamping body 16
rests on a bottom of the pocket-like receptacle 17. The supporting
regions 58 are spaced apart, wherein the rear supporting region 58,
oriented to the clamping web 54, is set back by a distance a, so
that all in all, including in connection with the obliquely
positioned clamping web 54, a good clamping effect is obtained.
[0041] The here described tool cassette 12, having the main body 24
and the cassette seat 26 configured correspondingly hereto, is
distinguished in general terms by the precisely fitting contact of
the main body 24 in the preferably all-round closed pocket 28,
wherein, to this end, the mating surfaces 32A, 32B correspond with
the associated contact surfaces 30A, 30B and extend over the whole
of the adjustment travel of the tool cassette 12 in the direction
of adjustment 18. The entire adjustment travel here lies preferably
in the region of up to 2.5 mm. All in all, a very large cassette
adjusting region is hereby obtained, which, in particular in the
configuration as a tool for rough machining or roughing, with large
nominal diameters greater than 30 mm and in particular greater than
55 mm, is of particular advantage.
* * * * *